Question about quadplane in SITL

I’ve been playing around with the quadplane model in SITL, and I noticed that if I disabled the servo outputs for the ailerons, elevator and rudder, and I set the Q_ASSIST_SPEED to something high - well above any flight speed the aircraft could reach, the aircraft seems to navigate just fine. Looking at RCouts in the HUD, I can see that the control surface values are all 1500, and the quad motors are active, during maneuvers.

Can anyone tell me - is this an accurate representation of the real world? Assuming the quad had sufficient authority, could you fly a quadplane without control surfaces in this way?